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Related Concept Videos

Sensation01:21

Sensation

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Sensory receptors are specialized neurons that respond to specific types of external stimuli, initiating the process known as sensation. This occurs when sensory input, such as light entering the eye, is detected by these receptors, causing chemical changes in the cells of the retina. These cells then convert the sensory stimulus into action potentials that are transmitted to the central nervous system, a process termed transduction.
Absolute thresholds can quantify the sensitivity of sensory...
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Related Experiment Video

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A Method for Tracking the Time Evolution of Steady-State Evoked Potentials
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Reaction Time Sensitivity to Spectrotemporal Modulations of Sound.

Lidwien C E Veugen1, A John van Opstal1, Marc M van Wanrooij1

  • 1Department of Biophysics, Donders Institute for Brain, Cognition and Behavior, 6029Radboud University, Nijmegen, Netherlands.

Trends in Hearing
|September 29, 2022
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Summary

This study shows that reaction times effectively measure how well people hear subtle sound changes. Impaired hearing simulations revealed unique listening strategies for spectral and temporal modulations.

Keywords:
auditory thresholdhearingmodulation transfer functionpsychoacousticsreaction time

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics

Background:

  • Assessing auditory perception in normal and impaired hearing is crucial.
  • Objective measures of spectrotemporal modulation sensitivity are needed.

Purpose of the Study:

  • To evaluate reaction time as an objective measure of acoustic spectrotemporal modulation sensitivity.
  • To investigate auditory perception in simulated normal and impaired hearing conditions.

Main Methods:

  • A manual reaction-time task was used to detect ripple onsets in broadband noise.
  • Simulated hearing impairment involved cochlear-implant vocoders and hearing aid processing (spectral smearing, low-pass filtering).
  • Binaural performance was analyzed using the race model of binaural independence.

Main Results:

  • Normal-hearing listeners showed band-pass sensitivity to spectral and temporal modulations, peaking around 1 cycle/octave and 32 Hz.
  • Simulated impaired hearing resulted in significantly slower reaction times, particularly at high spectral densities.
  • A 'best-of-both-worlds' strategy emerged in impaired hearing, utilizing different ears for spectral and temporal cues.
  • Despite time-spectrum separability, significant inseparable spectral-temporal interactions were observed.

Conclusions:

  • Reaction time is a valid and effective objective measure for acoustic spectrotemporal modulation sensitivity.
  • Simulated hearing impairment reveals distinct perceptual strategies and challenges.
  • Understanding spectrotemporal interactions is key to auditory processing in diverse hearing conditions.